Electric melting furnace



J. R, coE

ELECTRIC MELTING FURNACE Filed oct. 18, 1921 .5 shees-sheet 1 vwntoz JAMfS Fi. U05.

53 M @Heine f www Aug. 17 V, 1926 1,596,582#

J. R. COE

ELECTRIC MELTING FURNACE Filed Oct. 18, 1921 3 Sheets-Sheet 2 PatentedAug. 17, 1926.

UNITED STATES TAKES ROBERT COE, OF WATEBBURY, CONNECTICUT, ASSIGNOR TOTHE AMEBIC' BRASS COMPANY, 0F WATERBURY, CONNECTICUTLA CORPORATION OFCONNECTI CUT.

Application led October 18, 1921. Serial No. 508,446.

The 'present invention relates to furnaces and has slecial reference toinduction fur` sion extends, the transformer primary generatingsecondary currentsin the molten metal within the legs of the channel toheat and cause a flow of the metal within the channel and thus to effectthe desired melting and mixing of the metal within the container. Thelining of the channel box which constitutes the walls of the channel ismade of refract'oi v vmaterial which while in a dampened powdered orgranulated form is rammed into the metal casing, of the box so as to beintegral with the lining of the container .casing andafterivards themoisture .in the refractory material is dried out. This manner ofconstructing the channel lining has been found very difficult andexpensive and the drying processis liable to result in cracks andfissures in the channel b'ox lining.

The object of the present invention is to provide a channel box andliningfor a furnace of the type abo-ve indicated which is less expensiveand more perfect in construction than those heretofore produced.

Another object of the invention is to provide a novel and improvedfurnace of this type. i

The several features of the invention will be clearly understood fromthe following description and accompanying drawings, in which VFigures 1and 2 are side and frontelcvations, respectively, of a furnace embodyingthe features in their preferred form;

Fig 3 is a horizontal sectional view, partly in elevation, taken on theline l-l of Fis 2;' i

Fi llis, a vertical sectional view iartl' l 4 y iA i y ELECTRIC MELTING'FURNACE.

' provided with a central aperture 32. VVhenu.`

PATENT oFFIcEfI in elevation, 2; and ,l n

Fig. 5 is a detail front elevation of a co ponent part of the channelblock-on a A duced scale. y

The furnace illustrated in the drawings s provided with a crucible orcontainer 2,41, channel box 4 having a separate lining with asubstantially7 V-shaped channel 6 having A, its ends opening into thecontainer, anda-Aa transformer core Shaving a primary coil 48 frarranged to generate secondary` electric curs,y rents in themoltenrmetal within thele s of the channel as and for the purpose ful ydescribed in the patent to `Wyattrv No. 1,201,671 hereinbefore referredto.

As shown, the container is provided with a vertical cylindrical shellorv casing `1()v which is closed'b topand bottom plates 12 and 14,respectively, secured to the shell by means of angle-irons 16 embracingthe shell. The top plate 12 is provided with a charge opening 18 whichmay be closed-bym cover 20' pivoted lat 22 on fthe top plate. The bottomplate is rovided with a rec-y tangular o ening 24. or a purpose hereinfafterdescribed. The cylindrical shell 10 is provided with a lining 26ofheat insulating material, and an inner lining of refractory material27.

In the'illustrated construction, the chan-g: i nel box 4 is attached tothe container and the component parts of the channel box and its liningare assembled before they are at-` tached to the shell of thecontainer'v The channel box is provided with a lining or block 28 whichis made in two sections. Then sections of the block are separatelyformed@ or molded and each is provided with parallel faces. Thesesections are formed of rcfrace tory material and are then dried andbaked. A groove 3() is formed in a face of eachd section having itslower portion V-shapedlr and its ends extending to the top of .thesec-,2, tion, as shownlin Fig. 5. Each sectionis` taken onithe line thesections are assembled, ,the groovestl, register to form.y the channel6, and the ap-` y i ertiircs 32 in `the sections also register.V Theytivo sections of the block are then fesseln- ,A bled, the jointv 5 beingclosed by@ lsuitable cement 34v and'. clamped together Vlbygmeans. ofpilates v36 "non their i: nuten faces] vided with apertures whichregister with the apertures 32 in the sections so that when these partsare assembled a transverse cylindrical aperture 40 is provided in thechannel box and its lining. The plates correspond substantially in shapeto the faces of the sections but the upper edges'of the plates arespaced from the top of the sections and the edges of the lower portionsof the plates extend beyond and are arranged parallel with the sides ofthe lower portion of the sections. The edges of the lower portions ofthe plates are provided with inwardlyprojecting ribs or flanges 42 forholding heat insulating material 44 against which the sides of the lowerportion of the sections bear. y

The transformer is provided with a central leg 46 extending through theaperture 40 in thel channel box and encircled by a primary coil 478, andis further provided with outer legs 50 which are by means of adjustingscrews 54 supported on brackets 52 projecting laterally from the plates.

To attach the channel box and its lining to the container casing whenthe parts are thus assembled, the upper 'end of the channel block isinserted in the rectangular opening 24 in the bottom plate'lt of thecontainer and then the channel box is secured to the container casing bymeans of bolts 5,6 extending through the outer ends of the brackets 52and the lower flanges of horizontal channel irons58 having their upperflanges secured by rivets 60 to the margin of the bottom plate of thecontainer casing.

The refractory material 27 is then applied to the inner surface of thecontainer and about the sides and faces of the portion of the top of thechannel block lining that extends through the opening in the bottom ofthe container to form the lining for the container and to till the spacebetween the channel block llining and the wall of the opening being soplaced so as to form a close bond -where it contacts ywith the channelblock lining sections.

The. container is provided with a spout 66 secured to the shell 10 andleading from the interior of the container, a suitable aperture beingprovided -in the insulating lining 26 of the container. The refractorymaterial 27 extends through this aperture so as to be integral 'with thelining of the spout. In order to insure that secondary electric currentsshall not be generated in the clamppouring sections lying ing plates 36,the upper ends of the plates are spaced slightly from the bottom of thecontainer casing and the portion of the plates between the aperture 40and their uppenends is provided with a gap 68 (Fig. 2).

It will be apparent from the foregoing. that the illustrated furnace isof simple and i durable construction, that the parts thereof may beeasily constructed and assembled, and that the joint between thecontainer and channel block is effectively sealed so that there is nodanger of molten metal escaping.

substantially parallel to the 'front and rear .faces of the block.

By making the block in sections not only are cracked blocks detected,but the clampingof the blocks opposes the tendency of any cracks to openand the molten metal is thereby more effectively prevented from escapingthrough the joint between the sections or through any cracks extendingin a plane at all parallel with the joint.

While it is preferred to employ the speciic construction and arrangementof parts illustrated and described itis to be understood that thisconstruction and arrangement is not essential except so far as specificin the claims.

What I claim is:

1. A furnace of the class described having, in combination, a containerfor molten metal, the container, a lining for said box comprising aplurality of sections of refractory niaterial having in their adjacentinner faces registering surfaces forming a channel whose ends open intosaid container, said sections lying between the two parts of saidchannel box, means for holding said two parts together so as to clampthe said sections between them, and yielding material between the outerfaces of said sections and the two parts of said box.

2. A furnace of the class described having, in combination, metal, atwo-part channel box secured to the container. a lining for said boxcompria-4 ing a plurality of sections of refractory material having intheir adjacent inner faces registering surfaces forming a channel whoseends open into said container, said between the two parts of saidchannel box, means for holding said two a container for molten l partstogether so as to clamp the said sections between them, and a beatinsulatingr material supported by said channel box parts and locatedbeneath said sections.

3. A furnace of the class described haring, in combination, a containerfor molten metal, a two-part channel box secured to the container,alining for said box comprising a plurality of sections of refractorymaterial haring in their adjacent inner faces registering surfacesforming a channel whose ends open into said container. said sectionslying between the two parts oi said channel box, and means for holdingsaid two parts together so as to clamp the said sections between them,the upper ends of said sections extending upward into said container.the lining of said container being in intimate contact with said upperends.

4. A furnace. of the class described liaring. in combination, acontainer for molten metal comprising a casing and a lining there for, atwo-part channel box secured to said casing, and a separately formedblock haring a channel whose ends open into said container, said blockbeing clamped between the two parts of said box, the pressure being atright angles to the plane of said channel.

5. A furnace of the class described hai'- ing, in combination, acontainer for molten metal comprising a casing and a lining therefor. atwo-part channel box secured to said casing, and a separateljT formedblock having a. channel whose ends open into said contamer, said blockbeing clamped between the two parts of .said box and extending into.said container so as to be in intimate relation with its lining.

6. A furnace of the class described having, in combination a containerfor molten metal comprising a casing and a lining therefor, a two-partchannel bor.'` secured to said casing, a separately formed block havinga channel whose ends open into said container, said block being locatedbetween and supported by the two parts of said box and extending intosaid containerso as to be in intimate. relation with its lining, and aclosed magnetic transformer core supported on said channel box parts andsurrounding portions thereof. one leg of said transformer passingthrough said block and said parts, said parts having a gap to preventthe formation of secoiularv currents therein.

T. A. furnace of the class described hav- 8. A furnace ot the classdescribed hanf ing, in combination, a container for molten metalcomprising a c; sing and a lining therefor. a two-part channel boxSecured'to said casing, and a separately formed block haring a channelwhose ends open into said container, said block being clamped betweenthe two parts of said box, the pressure bt-ingnt right angles to theplane ot said channel, and yielding material between the outer faces ofsaid block and the two parts of said box.

t). A furnace of the class described having, in combination, a containerfor molten metal comprising a casing and a lining therefor, a two-partchannel. box secured to said casing and provided with inwardlyextent`ling projections adjacent to their bottoni portions. and aseparately formed block having a channel whose ends open into saidcontainer-,said block being located between the two parts oi said boxand extending up wardly so as to bc surrounded byvsaid lining, and heatinsulating material supported by said cliannel box nrojections andextending upwardly along the lower portions of said block.

l0. A furnace of the class described having. in combination, a containerfor molten metal comprising a casing and a lining there.- for, atwo-parl; channel box secured to said casing, a. sepaIatelj formed blockhaving a channel whose ends open into Said container, said block beingclamped between the two parts ot' said bex and extending into saidcontainer so as to be in intimate relation with its lining, a closed.magnetic transformer core supported on said channel box parts andsurrouiiding j iortions thereof, one leg of said transformer passingthrough said block and said parts, andmeans carried by said channel boxparts for adjusting the position of said transformer core.

JAMES ROBERT COE.

